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Mitigating parametric instabilities in plasmas by sunlight-like lasers

Authors :
H. H. Ma
Suming Weng
P. Gibbon
Jun-Yu Zhang
X. F. Li
S. H. Yew
Zheng-Ming Sheng
Shigeo Kawata
Source :
Matter and Radiation at Extremes, Vol 6, Iss 5, Pp 055902-055902-8 (2021), Matter and radiation at extremes 6(5), 055902-(2021). doi:10.1063/5.0054653
Publication Year :
2021
Publisher :
AIP Publishing LLC, 2021.

Abstract

Sunlight-like lasers that have a continuous broad frequency spectrum, random phase spectrum, and random polarization are formulated theoretically. With a sunlight-like laser beam consisting of a sequence of temporal speckles, the resonant three-wave coupling that underlies parametric instabilities in laser–plasma interactions can be greatly degraded owing to the limited duration of each speckle and the frequency shift between two adjacent speckles. The wave coupling can be further weakened by the random polarization of such beams. Numerical simulations demonstrate that the intensity threshold of stimulated Raman scattering in homogeneous plasmas can be doubled by using a sunlight-like laser beam with a relative bandwidth of ∼1% as compared with a monochromatic laser beam. Consequently, the hot-electron generation harmful to inertial confinement fusion can be effectively controlled by using sunlight-like laser drivers. Such drivers may be realized in the next generation of broadband lasers by combining two or more broadband beams with independent phase spectra or by applying polarization smoothing to a single broadband beam.

Details

Language :
English
ISSN :
24682047
Volume :
6
Issue :
5
Database :
OpenAIRE
Journal :
Matter and Radiation at Extremes
Accession number :
edsair.doi.dedup.....496be6bb862d913f3a5b09310363600c
Full Text :
https://doi.org/10.1063/5.0054653